CMMG Low Profile Gas Block .625 Inside Diameter Available to order on-line. Ships in 5-14 days $37.75
CMMG Gunbuilder's 308 Lower Parts Kit - MK3 For CMMG Mk3 Lowers and most LR308 type lowers AR-10 Available to order on-line. Ships in 5-14 days $54.95
CMMG Low Profile Gas Block .750 Inside Diameter Available to order on-line. Ships in 5-14 days $37.75